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  Quantum dots as templates for self-assembly of photoswitchable polymers: small, dual-color nanoparticles capable of facile photomodulation

Diaz, S. A., Giordano, L., Azcárate, J. C., Jovin, T. M., & Jares-Erijman, E. A. (2013). Quantum dots as templates for self-assembly of photoswitchable polymers: small, dual-color nanoparticles capable of facile photomodulation. Journal of the American Chemical Society, 135(8), 3208-3217. doi:10.1021/ja3117813.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-BB49-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-3B75-F
Genre: Journal Article

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1684359.pdf (Publisher version), 4MB
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http://pubs.acs.org/doi/pdf/10.1021/ja3117813 (Publisher version)
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Diaz, S. A.1, Author              
Giordano, L.1, Author              
Azcárate, J. C., Author
Jovin, T. M.1, Author              
Jares-Erijman, E. A., Author
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1Emeritus Group Laboratory of Cellular Dynamics, MPI for biophysical chemistry, Max Planck Society, ou_578628              

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 Abstract: A photomodulatable amphiphilic polymer has been synthesized with a backbone of poly[isobutylene-alt-maleic anhydride] and pendant dodecyl alkyl chains, Lucifer Yellow (LY) fluorescent probes, and diheteroarylethenes photochromic (PC) groups. The latter serve as reversible UV-activated FRET acceptors for the LY donors. We characterized the spectral and switching properties of the polymer in an organic solvent (CHCl3). In an aqueous medium the polymer forms polymersomes, constituting fluorescence probes 75 nm in diameter. Self-assembly of the polymer on the surface of a quantum dot (QD) serving as a template creates a dual-color photoswitchable nanoparticle (psNP) with improved properties due to the increase in polymer density and efficiency of PC photoconversion. The psNP exhibits a second QD red emission band that functions as an internal standard requiring only a single excitation wavelength, and is much reduced in size (<20 nm diameter) compared to the polymersomes. The QD template also greatly increases the depth of modulation by photochromic FRET of the LY emission monitored by both steady-state and time-resolved (lifetime) fluorescence (from 20%→70%, and from 12%→55%, respectively).

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Language(s): eng - English
 Dates: 2013-01-29
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/ja3117813
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Title: Journal of the American Chemical Society
Source Genre: Journal
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Pages: - Volume / Issue: 135 (8) Sequence Number: - Start / End Page: 3208 - 3217 Identifier: -